Australian brothers Byron and Lincoln Ryman look as though they were born months apart - but they're actually twins born within a minute of each other.

Byron weighed 3lb 6ozs when he was born first on March 15 and Lincoln arrived soon after weighing just 1lb 2oz at the Royal Hospital for Women at Randwick in Sydney.

Thanks to the efforts of medical staff the boys, who were induced 11 weeks early, are doing well. Byron is expected to leave hospital within a week to join proud parents Nicole and Todd, but Lincoln will remain in the hospital's Newborn Intensive Care Unit for at least another four weeks.